JigZone is an online Jigsaw Puzzle where you choose the level of difficulty from a simple 6 piece cut to a challenging 247 piece cut. You can upload your own photos to use as well! This would be a great way to focus in on your lesson when kids enter the room!
Plan Your Free Online Education at Lifehacker U: Spring Semester 2013
Funbrain, created for kids ages preschool through grade 8, offers more than 100 fun, interactive games that develop skills in math, reading, and literacy. Plus, kids can read a variety of popular books and comics on the site, including Diary of a Wimpy Kid, Amelia Writes Again, and Brewster Rocket.